The AMTROL 381404 AX15U is a pre-pressurized diaphragm-type expansion tank designed for use in closed-loop hydronic heating systems. It helps maintain stable system pressure by absorbing the expansion of water as it heats and preventing excessive pressure buildup that can damage boilers, piping, and system components.
Built with a heavy-duty steel shell and a durable butyl rubber diaphragm, the tank separates air from system water to ensure long-term reliability and consistent performance. The factory pre-charge allows for quick installation, while the compact design makes it suitable for residential and light commercial boiler systems.
The AX15U (commonly cross-referenced with Amtrol EX-15 style tanks) is widely used in baseboard heating, radiant heating, and boiler applications where dependable thermal expansion control is required.
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